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Effects of water-based gel electrolyte on the charge recombination and performance of dye-sensitized solar cells

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Abstract

A new water-based solution of ion-conductive polymeric gel electrolyte composed of polyethylene glycol and polyvinylpyrrolidone as gel-forming substances, I−/I3 − as reversible redox couple, and various ratios of acetonitrile/water solvents was prepared and used in the fabrication of dye-sensitized solar cells. The effects of water on the electrochemical behavior of the prepared electrolyte solutions were examined by the cyclic voltammetry and electrochemical impedance spectroscopy techniques. Electrochemical impedance spectroscopy was employed to quantify the charge-transfer resistance and the electron lifetime at the TiO2 conduction band. The characteristic peak shifted to a lower frequency in the Bode phase plot, which is an indication of a longer electron lifetime for the cell containing more water content. Photovoltaic performance of the cells prepared by the new water-based gel electrolyte was studied. Changes in the current density–voltage (J–V) characteristics can be explained based on the effect of water on the energetics and kinetics of charge transport and charge recombination in the dye-sensitized solar cells (DSSCs). It was observed that the increase in open-circuit voltage (V oc) and fill factor and decrease in J SC were noticeable for cells containing water-based gel electrolyte. It was indicated that the charge recombination between injected electrons and electron acceptors (polyiodide) in the redox electrolyte was remarkably inhibited by the increase of water. The photovoltaic performance stability of the DSSC containing gel electrolyte solution including 50 wt% of water was examined, and it was shown that it is more stable than conventional cells considerably for 168 h. Energy conversion efficiency of 2.30 % was achieved, under illumination with a simulated solar light of 100 mW cm−2.

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Authors and Affiliations

  1. Department of Physics, University of Yazd, Yazd, P.O. Box 89195-741, Iran

    Samaneh Mozaffari & Mahmood Borhanizarandi

  2. Department of Chemistry, Yazd branch, Islamic Azad University, Yazd, Iran

    Mohamad Reza Nateghi

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  1. Samaneh Mozaffari
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Mozaffari, S., Nateghi, M.R. & Borhanizarandi, M. Effects of water-based gel electrolyte on the charge recombination and performance of dye-sensitized solar cells. J Solid State Electrochem 18, 2589–2598 (2014). https://doi.org/10.1007/s10008-014-2508-x

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